Most electric rc helicopters follow the conventional layout with a single main rotor and a tail rotor, but there are some that have two sets of main rotors, one above the other, and no tail rotor; these are called coaxial, dual rotor or contra-rotating helicopters. The E-flite Blade CX3, shown above, is a fine example.
Based on the real life MD 520N helicopter, the Blade CX3 is successor to the hugely popular Blade CX2, the best-selling coaxial rc helicopter to date.
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